One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,6)(5,8)(17,18,22,27,23,28,21,26)(19,24,32,40,30,38,31,39)(20,33,34,41,35,42,36,25)(29,43,45,47,44,48,46,37)(1,3)(2,5)(4,8)(6,7)(9,10)(11,15)(12,14)(13,16)(17,19,23,30)(18,24,28,38)(20,29,35,44)(21,31,22,32)(25,37,41,47)(26,39,27,40)(33,43,42,48)(34,45,36,46)(3,8)(5,7)(9,11,12,16)(10,13,14,15)(17,20)(18,25)(19,29)(21,34)(22,36)(23,35)(24,37)(26,33)(27,42)(28,41)(30,44)(31,45)(32,46)(38,47)(39,43)(40,48)(2,6)(5,7)(19,30)(24,38)(29,44)(31,32)(37,47)(39,40)(43,48)(45,46) involution — undirected(10,14)(13,15)(17,21,23,22)(18,26,28,27)(19,31,30,32)(20,34,35,36)(24,39,38,40)(25,33,41,42)(29,45,44,46)(37,43,47,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.